Emacs pedal menus

The pedal menu system is based on tmm.el, the text mode menus
package that comes with emacs. It uses the menu pedal to bring up the menu, the forward pedal (and backward pedal if
necessary) to move onto the right entry,and the menu pedal again
select it. Thus, it is similar to having Versor working within
the menu system.

This then used to navigate the ordinary Emacs menus.

It is also used as the basis for the flexible choosing system, in which
you choose from a large selection of possibilities by going down a
tree structure created automatically on the fly.